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Rifles, Reloading, Optics, Equipment
Reloading
300 Win Mag Build and Loading Questions.
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<blockquote data-quote="Wisner74" data-source="post: 1147511" data-attributes="member: 12572"><p>On the 1:12 twist.... I talked to Boots Obermeyer to order a barrel. Told him I wanted a 1:10 twist to shoot 180-200 grain bullets for a long range rifle.He wanted to know exactly what I was hunting. . After I gave home the info he said he was going to make me a number 4 fluted barrel 26" with 1:12 twist. He said any twist faster in a 5r cut rifle barrel at 300 WM velocity has caused jacket seperation. </p><p></p><p>His exact words are below:</p><p></p><p> (The 10 twist in 30's came from the 30-40 Kraig prior to 1900 shooting bullets around 220. The</p><p>10 twist kept going through the 1903 Springfield's and the M1 as all the equipment was set up for 10.</p><p>When the M14 came on the twist was slowed to 1-12 and bullet over 170 were often used.</p><p> Now it the spin rate in Rev's per second that generate the centrifugal force to keep the bullet</p><p>stable so with higher speed you want less twist for the same Rev's per second. Also very important the</p><p>thrust on the jacket is reduced causing less jacket breakage which means a shot way off target. For</p><p>target rifles for 1000 yards twist are slowed down, sometimes to 1-14)</p><p></p><p>So with that being said I felt it safe to trust his recommendation.</p></blockquote><p></p>
[QUOTE="Wisner74, post: 1147511, member: 12572"] On the 1:12 twist.... I talked to Boots Obermeyer to order a barrel. Told him I wanted a 1:10 twist to shoot 180-200 grain bullets for a long range rifle.He wanted to know exactly what I was hunting. . After I gave home the info he said he was going to make me a number 4 fluted barrel 26" with 1:12 twist. He said any twist faster in a 5r cut rifle barrel at 300 WM velocity has caused jacket seperation. His exact words are below: (The 10 twist in 30's came from the 30-40 Kraig prior to 1900 shooting bullets around 220. The 10 twist kept going through the 1903 Springfield's and the M1 as all the equipment was set up for 10. When the M14 came on the twist was slowed to 1-12 and bullet over 170 were often used. Now it the spin rate in Rev's per second that generate the centrifugal force to keep the bullet stable so with higher speed you want less twist for the same Rev's per second. Also very important the thrust on the jacket is reduced causing less jacket breakage which means a shot way off target. For target rifles for 1000 yards twist are slowed down, sometimes to 1-14) So with that being said I felt it safe to trust his recommendation. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
300 Win Mag Build and Loading Questions.
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